2006A&A...454L.115G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.15CEST08:18:24

2006A&A...454L.115G - Astronomy and Astrophysics, volume 454, L115-118 (2006/8-1)

CO(4-3) and CO(7-6) maps of the nucleus of NGC253.

GUESTEN R., PHILIPP S.D., WEISS A. and KLEIN B.

Abstract (from CDS):

Molecular line excitation studies of the nuclei of nearby starburst galaxies yield important information on the starburst phenomena, in particular on the temperature and density of the star-forming gas. Such studies also provide templates for high redshift galaxies with even more extreme star formation. Fundamental constraints on the physical properties in the nuclear regions of external galaxies can be derived from the spectral energy distribution (i.e., integrated flux density vs. rotational quantum number) of CO rotational emission arising from warm gas. The resolution and sensitivity of the APEX telescope makes it feasible to perform spatially resolved studies of submillimeter (submm) CO emission from the warm, dense gas in nearby starburst nuclei. Using the FLASH dual-channel heterodyne receiver we mapped emission in the CO J=4-3 and 7-6 lines toward the archetypical nuclear starburst galaxy NGC253. Combining our new observations with data from the literature, we derive the CO line SED in the central 250pc of NGC253, which peaks near the 6-5 transition and has a shape very similar to that of M82. All CO transitions in the central region can well be fitted with a single temperature/density Large Velocity Gradient (LVG) model. A good match to the observations is found by assuming kinetic gas temperatures that are comparable to the dust temperature (Tkin≃60K) and a H2 density of order 104cm–3. Our very first APEX submm study of a nearby starburst nucleus (NGC253) meaningfully constrains the physical properties of the star-forming molecular gas it contains. With broader band spectrometers and a chopping secondary coming soon, the impact of APEX on extragalactic astrophysics will be foreseeably significant.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: nuclei - galaxies: starburst

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2931 2
2 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1438 0
3 ESO 495-21 bCG 08 36 15.190 -26 24 33.66 12.04 11.93 11.45 11.09 12.3 ~ 501 3
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5336 6
5 QSO B1202-074 QSO 12 05 23.12 -07 42 32.4     17.5     ~ 349 5
6 NAME SMM J16359+6613 G 16 35 55.62 +66 12 59.5           ~ 59 1
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11542 0

    Equat.    Gal    SGal    Ecl

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2020.07.15-08:18:24

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